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    <article class="post">
        <header>
            <h1 class="post-title">如何在Flutter中使Expanded中的文本可滚动</h1>
        </header>
        <date class="post-meta meta-date">
            2021年9月2日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <p>我正在忙着用闪存卡构建一个应用程序，其中包含有关它们的信息，但我遇到了一个我似乎无法弄清楚的愚蠢问题。</p>
<p>为了给出上下文，卡片小部件目前如下所示:</p>
<p>
        <a data-fancybox="gallery" href="https://i.stack.imgur.com/7Bmrc.png">
            <img class="mx-auto" alt="img" src="https://i.stack.imgur.com/7Bmrc.png" />
        </a>
    </p>
<p>如您所见，文本被切断了。我试过将 Expanded 更改为 SingleChildScrollView，但最终我遇到了这种情况:</p>
<p>
        <a data-fancybox="gallery" href="https://i.stack.imgur.com/nj2jC.png">
            <img class="mx-auto" alt="img" src="https://i.stack.imgur.com/nj2jC.png" />
        </a>
    </p>
<p>我知道解决方案可能很简单，但我已经摆弄了几个小时</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#75715e">// TODO: implement build
</span><span style="color:#75715e"></span>    <span style="color:#66d9ef">return</span> Container(
      padding: EdgeInsets.symmetric(vertical: <span style="color:#ae81ff">15</span>, horizontal: <span style="color:#ae81ff">10</span>),
      decoration: BoxDecoration(
        color: Colors.indigo,
        borderRadius: BorderRadius.circular(<span style="color:#ae81ff">20</span>),
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          Row(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
              Image.asset(
                getCategoryImage(),
                width: <span style="color:#ae81ff">50</span>
              ),
              Container(width: <span style="color:#ae81ff">10</span>),
              Text(
                title,
                style: TextStyle(
                  fontFamily: <span style="color:#e6db74">&#34;Estherilla&#34;</span>,
                  fontSize: <span style="color:#ae81ff">30</span>,
                  color: Colors.white
                ),
              )
            ],
          ),
          SingleChildScrollView(
            child: Padding(
              padding: <span style="color:#66d9ef">const</span> EdgeInsets.symmetric(vertical: <span style="color:#ae81ff">25</span>),
              child: Text(
                content,
                style: TextStyle(
                  fontSize: <span style="color:#ae81ff">25</span>,
                  color: Colors.white
                ),
              ),
            )
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.end,
            children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
              Text(
                <span style="color:#e6db74">&#34;#</span><span style="color:#e6db74">$</span>author<span style="color:#e6db74">&#34;</span>,
                style: TextStyle(
                  fontFamily: <span style="color:#e6db74">&#34;Estherilla&#34;</span>,
                  color: Colors.white,
                  fontSize: <span style="color:#ae81ff">20</span>
                ),
              )
            ],
          )
        ],
      ),
    );
  }
</code></pre></div><p><strong>最佳答案</strong></p>
<p>包裹您的 <code>SingleChildScrollView</code>里面<code>Expanded</code>像这样的小部件</p>
<pre><code> Column(
   ...

   Expanded(
     child: SingleChildScrollView(...)
   ),

   ...
 )
</code></pre><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">package com.example.flutter_contacts

<span style="color:#66d9ef">import</span> android<span style="color:#960050;background-color:#1e0010">.</span>app<span style="color:#960050;background-color:#1e0010">.</span>Activity
import android<span style="color:#960050;background-color:#1e0010">.</span>content<span style="color:#960050;background-color:#1e0010">.</span>Intent
import android<span style="color:#960050;background-color:#1e0010">.</span>os<span style="color:#960050;background-color:#1e0010">.</span>Bundle
import android<span style="color:#960050;background-color:#1e0010">.</span>provider<span style="color:#960050;background-color:#1e0010">.</span>ContactsContract
import io<span style="color:#960050;background-color:#1e0010">.</span>flutter<span style="color:#960050;background-color:#1e0010">.</span>app<span style="color:#960050;background-color:#1e0010">.</span>FlutterActivity
import io<span style="color:#960050;background-color:#1e0010">.</span>flutter<span style="color:#960050;background-color:#1e0010">.</span>plugin<span style="color:#960050;background-color:#1e0010">.</span>common<span style="color:#960050;background-color:#1e0010">.</span>MethodChannel
import io<span style="color:#960050;background-color:#1e0010">.</span>flutter<span style="color:#960050;background-color:#1e0010">.</span>plugins<span style="color:#960050;background-color:#1e0010">.</span>GeneratedPluginRegistrant

class MainActivity <span style="color:#960050;background-color:#1e0010">:</span> FlutterActivity<span style="color:#960050;background-color:#1e0010">()</span> <span style="color:#960050;background-color:#1e0010">{</span>

    var lastResult<span style="color:#960050;background-color:#1e0010">:</span> MethodChannel<span style="color:#960050;background-color:#1e0010">.</span>Result<span style="color:#960050;background-color:#1e0010">?</span> <span style="color:#960050;background-color:#1e0010">=</span> null

    override fun onCreate<span style="color:#960050;background-color:#1e0010">(</span>savedInstanceState<span style="color:#960050;background-color:#1e0010">:</span> Bundle<span style="color:#960050;background-color:#1e0010">?)</span> <span style="color:#960050;background-color:#1e0010">{</span>
        super<span style="color:#960050;background-color:#1e0010">.</span>onCreate<span style="color:#960050;background-color:#1e0010">(</span>savedInstanceState<span style="color:#960050;background-color:#1e0010">)</span>
        GeneratedPluginRegistrant<span style="color:#960050;background-color:#1e0010">.</span>registerWith<span style="color:#960050;background-color:#1e0010">(</span>this<span style="color:#960050;background-color:#1e0010">)</span>

        MethodChannel<span style="color:#960050;background-color:#1e0010">(</span>flutterView, CHANNEL<span style="color:#960050;background-color:#1e0010">).</span>setMethodCallHandler <span style="color:#960050;background-color:#1e0010">{</span> call, result <span style="color:#960050;background-color:#1e0010">-&gt;</span>
            lastResult <span style="color:#960050;background-color:#1e0010">=</span> result
            launchContactActivity<span style="color:#960050;background-color:#1e0010">()</span>
        <span style="color:#960050;background-color:#1e0010">}</span>
    <span style="color:#960050;background-color:#1e0010">}</span>

    override fun onActivityResult<span style="color:#960050;background-color:#1e0010">(</span>requestCode<span style="color:#960050;background-color:#1e0010">:</span> Int, resultCode<span style="color:#960050;background-color:#1e0010">:</span> Int, data<span style="color:#960050;background-color:#1e0010">:</span> Intent<span style="color:#960050;background-color:#1e0010">?)</span> <span style="color:#960050;background-color:#1e0010">{</span>
        super<span style="color:#960050;background-color:#1e0010">.</span>onActivityResult<span style="color:#960050;background-color:#1e0010">(</span>requestCode, resultCode, data<span style="color:#960050;background-color:#1e0010">)</span>
        if <span style="color:#960050;background-color:#1e0010">(</span>requestCode <span style="color:#960050;background-color:#1e0010">==</span> REQUEST_CODE<span style="color:#960050;background-color:#1e0010">)</span> <span style="color:#960050;background-color:#1e0010">{</span>
            if <span style="color:#960050;background-color:#1e0010">(</span>resultCode <span style="color:#960050;background-color:#1e0010">==</span> Activity<span style="color:#960050;background-color:#1e0010">.</span>RESULT_OK<span style="color:#960050;background-color:#1e0010">)</span> <span style="color:#960050;background-color:#1e0010">{</span>
                lastResult<span style="color:#960050;background-color:#1e0010">?.</span>success<span style="color:#960050;background-color:#1e0010">(</span><span style="color:#e6db74">&#34;Done!&#34;</span><span style="color:#960050;background-color:#1e0010">)</span>
            <span style="color:#960050;background-color:#1e0010">}</span> else <span style="color:#960050;background-color:#1e0010">{</span>
                lastResult<span style="color:#960050;background-color:#1e0010">?.</span>error<span style="color:#960050;background-color:#1e0010">(</span><span style="color:#e6db74">&#34;Error&#34;</span>, <span style="color:#e6db74">&#34;Can&#39;t launch contacts&#34;</span>, <span style="color:#e6db74">&#34;&#34;</span><span style="color:#960050;background-color:#1e0010">)</span>
            <span style="color:#960050;background-color:#1e0010">}</span>
        <span style="color:#960050;background-color:#1e0010">}</span>
    <span style="color:#960050;background-color:#1e0010">}</span>

    private fun launchContactActivity<span style="color:#960050;background-color:#1e0010">()</span> <span style="color:#960050;background-color:#1e0010">{</span>
        val intent <span style="color:#960050;background-color:#1e0010">=</span> Intent<span style="color:#960050;background-color:#1e0010">(</span>Intent<span style="color:#960050;background-color:#1e0010">.</span>ACTION_VIEW<span style="color:#960050;background-color:#1e0010">)</span>
        intent<span style="color:#960050;background-color:#1e0010">.</span>type <span style="color:#960050;background-color:#1e0010">=</span> ContactsContract<span style="color:#960050;background-color:#1e0010">.</span>Contacts<span style="color:#960050;background-color:#1e0010">.</span>CONTENT_TYPE
        startActivityForResult<span style="color:#960050;background-color:#1e0010">(</span>intent, REQUEST_CODE<span style="color:#960050;background-color:#1e0010">)</span>
    <span style="color:#960050;background-color:#1e0010">}</span>

    companion object <span style="color:#960050;background-color:#1e0010">{</span>
        private const val CHANNEL <span style="color:#960050;background-color:#1e0010">=</span> <span style="color:#e6db74">&#34;flutter_contacts/launch_contacts&#34;</span>
        private const val REQUEST_CODE <span style="color:#960050;background-color:#1e0010">=</span> <span style="color:#960050;background-color:#1e0010">42</span>
    <span style="color:#960050;background-color:#1e0010">}</span>
<span style="color:#960050;background-color:#1e0010">}</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/services.dart&#39;</span>;

<span style="color:#66d9ef">void</span> main() <span style="color:#f92672">=&gt;</span> runApp(MyApp());

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> MaterialApp(
      title: <span style="color:#e6db74">&#39;Flutter Demo&#39;</span>,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyHomePage</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  _MyHomePageState createState() <span style="color:#f92672">=&gt;</span> _MyHomePageState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_MyHomePageState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>MyHomePage<span style="color:#f92672">&gt;</span> {
  <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">const</span> platform <span style="color:#f92672">=</span>
      <span style="color:#66d9ef">const</span> MethodChannel(<span style="color:#e6db74">&#39;flutter_contacts/launch_contacts&#39;</span>);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Scaffold(
      appBar: AppBar(
        title: Text(<span style="color:#e6db74">&#39;Contacts sample&#39;</span>),
      ),
      body: Center(
        child: RaisedButton(
          child: Text(<span style="color:#e6db74">&#34;Launch contact activity&#34;</span>),
          onPressed: () <span style="color:#66d9ef">async</span> <span style="color:#f92672">=&gt;</span> launchContacts(),
        ),
      ),
    );
  }

  <span style="color:#66d9ef">void</span> launchContacts() <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">try</span> {
      <span style="color:#66d9ef">await</span> platform.invokeMethod(<span style="color:#e6db74">&#39;launch&#39;</span>);
    } on PlatformException <span style="color:#66d9ef">catch</span> (e) {
      print(<span style="color:#e6db74">&#34;Failed to launch contacts: </span><span style="color:#e6db74">${</span>e.message<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;</span>);
    }
    setState(() {
    });
  }
}
</code></pre></div><h1 id="扫描条形码打开链接">扫描条形码打开链接</h1>
<p>我有一个关于 Flutter 中二维码扫描的小问题。二维码读取数据成功后如何打开网址？</p>
<p>我使用<a href="https://pub.dev/packages/barcode_scan">这个</a>包来使用 QR 码，<a href="https://pub.dev/packages/url_launcher#-installing-tab-">这</a>用于打开一个 URL，这是我检查来自 QR 码的数据值是否为 URL 的功能，如果它是 URL，则运行该功能以打开网站。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">checkingValue() {
    <span style="color:#66d9ef">if</span> (_result <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span> <span style="color:#f92672">||</span> _result <span style="color:#f92672">!=</span> <span style="color:#e6db74">&#34;&#34;</span>) {
      <span style="color:#66d9ef">if</span> (_result.contains(<span style="color:#e6db74">&#34;https&#34;</span>) <span style="color:#f92672">||</span> _result.contains(<span style="color:#e6db74">&#34;http&#34;</span>)) {
        <span style="color:#66d9ef">return</span> _launchURL(_result);
      } <span style="color:#66d9ef">else</span> {
        Toast.show(<span style="color:#e6db74">&#34;Invalide URL&#34;</span>, context,
            duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
      }
    } <span style="color:#66d9ef">else</span> {
      <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span>;
    }
  }

  _launchURL(<span style="color:#66d9ef">String</span> urlQRCode) <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">String</span> url <span style="color:#f92672">=</span> urlQRCode;
    <span style="color:#66d9ef">if</span> (<span style="color:#66d9ef">await</span> canLaunch(url)) {
      <span style="color:#66d9ef">await</span> launch(url);
    } <span style="color:#66d9ef">else</span> {
      <span style="color:#66d9ef">throw</span> <span style="color:#e6db74">&#39;Could not launch </span><span style="color:#e6db74">$</span>url<span style="color:#e6db74">&#39;</span>;
    }
  }
</code></pre></div><p>该<code>_result</code>变量是一个字符串摆脱QR码数据的值。</p>
<p>这是我的全部代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_ScannerPageState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>ScannerPage<span style="color:#f92672">&gt;</span> {

  <span style="color:#66d9ef">String</span> _password;
  <span style="color:#66d9ef">String</span> _result <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;&#34;</span>;

  Future _scanQR() <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">try</span> {
      <span style="color:#66d9ef">String</span> qrResult <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> BarcodeScanner.scan();
      setState(() {
        _result <span style="color:#f92672">=</span> qrResult;
      });
    } on PlatformException <span style="color:#66d9ef">catch</span> (ex) {
      <span style="color:#66d9ef">if</span> (ex.code <span style="color:#f92672">==</span> BarcodeScanner.CameraAccessDenied) {
        setState(() {
          _result <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;Camera permission was denied&#34;</span>;
          Toast.show(_result, context,
              duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
        });
      } <span style="color:#66d9ef">else</span> {
        setState(() {
          _result <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;Unknown Error </span><span style="color:#e6db74">$</span>ex<span style="color:#e6db74">&#34;</span>;
          Toast.show(_result, context,
              duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
        });
      }
    } on FormatException {
      setState(() {
        _result <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;You pressed the back button before scanning anything&#34;</span>;
        Toast.show(_result, context,
            duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
      });
    } <span style="color:#66d9ef">catch</span> (ex) {
      setState(() {
        _result <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;Unknown Error </span><span style="color:#e6db74">$</span>ex<span style="color:#e6db74">&#34;</span>;
        Toast.show(_result, context,
            duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
      });
    }
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> WillPopScope(
      onWillPop: () {
        <span style="color:#66d9ef">return</span> showDialog(
            barrierDismissible: <span style="color:#66d9ef">false</span>,
            context: context,
            builder: (BuildContext context) {
              <span style="color:#66d9ef">return</span> PopUp(
                content: <span style="color:#e6db74">&#34;Are you sure want to exit?&#34;</span>,
                cancelText: <span style="color:#e6db74">&#34;No&#34;</span>,
                acceptText: <span style="color:#e6db74">&#34;Yes&#34;</span>,
                onTapCancel: () <span style="color:#f92672">=&gt;</span> Navigator.of(context).pop(),
                onTapAccept: () <span style="color:#66d9ef">async</span> {
                  <span style="color:#66d9ef">await</span> SessionManager().removeSession();<span style="color:#75715e">//
</span><span style="color:#75715e"></span>                  <span style="color:#66d9ef">await</span> SystemNavigator.pop();
                },
              );
            }
        );
      },
      child: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
          actions: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            IconButton(
              icon: Icon(Icons.lock),
              onPressed: () {
                Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/login&#39;</span>);
              },
            ),
          ],
        ),
        body: Column(
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            Text(_result.contains(<span style="color:#e6db74">&#34;https&#34;</span>) <span style="color:#f92672">||</span> _result.contains(<span style="color:#e6db74">&#34;http&#34;</span>) <span style="color:#f92672">?</span> _result <span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;Invalid URL&#34;</span>),
          ],
        ),
        floatingActionButton: FloatingActionButton.extended(
          icon: Icon(Icons.camera_alt),
          label: Text(<span style="color:#e6db74">&#34;Scan&#34;</span>),
          onPressed: () <span style="color:#f92672">=&gt;</span> _scanQR(),
        ),
        floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
      ),
    );
  }

  checkingValue() {
    <span style="color:#66d9ef">if</span> (_result <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span> <span style="color:#f92672">||</span> _result <span style="color:#f92672">!=</span> <span style="color:#e6db74">&#34;&#34;</span>) {
      <span style="color:#66d9ef">if</span> (_result.contains(<span style="color:#e6db74">&#34;https&#34;</span>) <span style="color:#f92672">||</span> _result.contains(<span style="color:#e6db74">&#34;http&#34;</span>)) {
        <span style="color:#66d9ef">return</span> _launchURL(_result);
      } <span style="color:#66d9ef">else</span> {
        Toast.show(<span style="color:#e6db74">&#34;Invalide URL&#34;</span>, context,
            duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
      }
    } <span style="color:#66d9ef">else</span> {
      <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span>;
    }
  }

  _launchURL(<span style="color:#66d9ef">String</span> urlQRCode) <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">String</span> url <span style="color:#f92672">=</span> urlQRCode;
    <span style="color:#66d9ef">if</span> (<span style="color:#66d9ef">await</span> canLaunch(url)) {
      <span style="color:#66d9ef">await</span> launch(url);
    } <span style="color:#66d9ef">else</span> {
      <span style="color:#66d9ef">throw</span> <span style="color:#e6db74">&#39;Could not launch </span><span style="color:#e6db74">$</span>url<span style="color:#e6db74">&#39;</span>;
    }
  }

}
</code></pre></div><p>那么，我把<code>checkingValue()</code>扫描二维码后运行它的功能放在哪里？</p>
<p>递<code>qrResult</code>给<code>checkingValue</code>方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Future _scanQR() <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">try</span> {
      <span style="color:#66d9ef">String</span> qrResult <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> BarcodeScanner.scan();
      checkingValue(qrResult);
     <span style="color:#75715e">//....
</span><span style="color:#75715e"></span>    }
</code></pre></div><p><code>checkingValue</code> 方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">checkingValue(<span style="color:#66d9ef">String</span> url) {
    <span style="color:#75715e">//...
</span><span style="color:#75715e"></span>}
</code></pre></div><p>或拨打<code>checkingValue()</code>后</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">setState(() {_result <span style="color:#f92672">=</span> qrResult;});
checkingValue();
<span style="color:#75715e">//...
</span></code></pre></div><h1 id="flutter---url出现在网站名称的位置">flutter - URL出现在网站名称的位置</h1>
<p>从Android Studio运行时:
<a href="https://i.stack.imgur.com/ccUfC.jpg">
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/ccUfC.jpg">
            <img class="mx-auto" alt="enter image description here" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/ccUfC.jpg" />
        </a>
    </a>
托管后:
<a href="https://i.stack.imgur.com/rmE8S.jpg">
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/rmE8S.jpg">
            <img class="mx-auto" alt="enter image description here" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/rmE8S.jpg" />
        </a>
    </a>
我希望我的网站名称显示在该位置。
因此，如果有人可以帮助我，谢谢!</p>
<p><strong>最佳答案</strong></p>
<p>您需要设置MaterialApp的标题。像这样:</p>
<pre><code>  MaterialApp(
      title: 'Welcome - Ajith'
</code></pre><h1 id="flutter---如何注意用户何时松开手指">flutter - 如何注意用户何时松开手指</h1>
<p>我有一个listView.Builder，想在用户在屏幕上松开手指时根据scrollController的位置进行某些计算吗？</p>
<p>计算部分很容易抖动，但是如何注意到用户从滚动中释放手指来执行某些操作？</p>
<p><strong>最佳答案</strong></p>
<p>使用NotificationListener窗口小部件。 <a href="https://www.youtube.com/watch?v=cAnFbFoGM50">Here</a>是它的简短片段。</p>
<p>您可能想要的代码如下所示:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#960050;background-color:#1e0010">@</span>override
Widget build(BuildContext context) {    
    <span style="color:#66d9ef">return</span> NotificationListener<span style="color:#f92672">&lt;</span>ScrollNotification<span style="color:#f92672">&gt;</span>(
        onNotification: (notification) {
            <span style="color:#66d9ef">if</span> (notification <span style="color:#66d9ef">is</span> ScrollStartNotification) {
                debugPrint(<span style="color:#e6db74">&#39;Started&#39;</span>);
            }
            <span style="color:#66d9ef">if</span> (notification <span style="color:#66d9ef">is</span> ScrollUpdateNotification) {
                debugPrint(<span style="color:#e6db74">&#39;Updated&#39;</span>);
            }
            <span style="color:#66d9ef">if</span> (notification <span style="color:#66d9ef">is</span> ScrollEndNotification) {
                debugPrint(<span style="color:#e6db74">&#39;Ended&#39;</span>);
            }
            <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">false</span>;
        },
        child: YourListView(),
    );
}   
</code></pre></div><h1 id="flutter---如何创建联系人列表">flutter - 如何创建联系人列表</h1>
<p>这是我要从中将信息导入到ContactsPage的contacts_data页面:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">Contact</span> {
  <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> fullName;
   <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> email;

   <span style="color:#66d9ef">const</span> Contact({<span style="color:#66d9ef">this</span>.fullName, <span style="color:#66d9ef">this</span>.email});
}


<span style="color:#66d9ef">const</span> kContacts <span style="color:#f92672">=</span> <span style="color:#66d9ef">const</span> <span style="color:#f92672">&lt;</span>Contact<span style="color:#f92672">&gt;</span>[
  <span style="color:#66d9ef">const</span> Contact(
  fullName: <span style="color:#e6db74">&#39;Romain Hoogmoed&#39;</span>,
  email:<span style="color:#e6db74">&#39;romain.hoogmoed@example.com&#39;</span>
  ),
   <span style="color:#66d9ef">const</span> Contact(
      fullName: <span style="color:#e6db74">&#39;Emilie Olsen&#39;</span>,
      email:<span style="color:#e6db74">&#39;emilie.olsen@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
       fullName: <span style="color:#e6db74">&#39;Téo Lefevre&#39;</span>,
      email:<span style="color:#e6db74">&#39;téo.lefevre@example.com&#39;</span>
   ),
  <span style="color:#66d9ef">const</span> Contact(
      fullName: <span style="color:#e6db74">&#39;Nicole Cruz&#39;</span>,
      email:<span style="color:#e6db74">&#39;nicole.cruz@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
      fullName: <span style="color:#e6db74">&#39;Ramna Peixoto&#39;</span>,
      email:<span style="color:#e6db74">&#39;ramna.peixoto@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
      fullName: <span style="color:#e6db74">&#39;Jose Ortiz&#39;</span>,
      email:<span style="color:#e6db74">&#39;jose.ortiz@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Alma Christensen&#39;</span>,
     email:<span style="color:#e6db74">&#39;alma.christensen@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Sergio Hill&#39;</span>,
     email:<span style="color:#e6db74">&#39;sergio.hill@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Malo Gonzalez&#39;</span>,
     email:<span style="color:#e6db74">&#39;malo.gonzalez@example.com&#39;</span>
 ),
 <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Miguel Owens&#39;</span>,
     email:<span style="color:#e6db74">&#39;miguel.owens@example.com&#39;</span>
 ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Lilou Dumont&#39;</span>,
     email:<span style="color:#e6db74">&#39;lilou.dumont@example.com&#39;</span>
 ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Ashley Stewart&#39;</span>,
     email:<span style="color:#e6db74">&#39;ashley.stewart@example.com&#39;</span>
  ),
  <span style="color:#66d9ef">const</span> Contact(
       fullName: <span style="color:#e6db74">&#39;Roman Zhang&#39;</span>,
      email:<span style="color:#e6db74">&#39;roman.zhang@example.com&#39;</span>
 ),
  <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Ryan Roberts&#39;</span>,
     email:<span style="color:#e6db74">&#39;ryan.roberts@example.com&#39;</span>
 ),
 <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Sadie Thomas&#39;</span>,
     email:<span style="color:#e6db74">&#39;sadie.thomas@example.com&#39;</span>
 ),
 <span style="color:#66d9ef">const</span> Contact(
     fullName: <span style="color:#e6db74">&#39;Belen Serrano&#39;</span>,
     email:<span style="color:#e6db74">&#39;belen.serrano@example.com &#39;</span>
  )];


</code></pre></div><p>我修复了代码，有些小部件不可用。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">    <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ContactsPage</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
      <span style="color:#960050;background-color:#1e0010">@</span>override
      Widget build(BuildContext context) {
        <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> Scaffold(
            appBar: <span style="color:#66d9ef">new</span> AppBar(
              title: <span style="color:#66d9ef">new</span> Text(<span style="color:#e6db74">&#34;Contacts&#34;</span>),
            ),
            body: <span style="color:#66d9ef">new</span> ContactList(kContacts));
      }
    }

    <span style="color:#66d9ef">const</span> kContacts <span style="color:#f92672">=</span> <span style="color:#66d9ef">const</span> <span style="color:#f92672">&lt;</span>Contact<span style="color:#f92672">&gt;</span>[
      <span style="color:#66d9ef">const</span> Contact(
          fullName: <span style="color:#e6db74">&#39;Romain Hoogmoed&#39;</span>, email: <span style="color:#e6db74">&#39;romain.hoogmoed@example.com&#39;</span>),
      <span style="color:#66d9ef">const</span> Contact(fullName: <span style="color:#e6db74">&#39;Emilie Olsen&#39;</span>, email: <span style="color:#e6db74">&#39;emilie.olsen@example.com&#39;</span>)
    ];

    <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ContactList</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
      <span style="color:#66d9ef">final</span> List<span style="color:#f92672">&lt;</span>Contact<span style="color:#f92672">&gt;</span> _contacts;

      ContactList(<span style="color:#66d9ef">this</span>._contacts);

      <span style="color:#960050;background-color:#1e0010">@</span>override
      Widget build(BuildContext context) {
        <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> ListView.builder(
          padding: <span style="color:#66d9ef">new</span> EdgeInsets.symmetric(vertical: <span style="color:#ae81ff">8.0</span>),
          itemBuilder: (context, index) {
            <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> _ContactListItem(_contacts[index]);
          },
          itemCount: _contacts.length,
        );
      }
    }

    <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_ContactListItem</span> <span style="color:#66d9ef">extends</span> ListTile {
      _ContactListItem(Contact contact)
          <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(
                title: <span style="color:#66d9ef">new</span> Text(contact.fullName),
                subtitle: <span style="color:#66d9ef">new</span> Text(contact.email),
                leading: <span style="color:#66d9ef">new</span> CircleAvatar(child: <span style="color:#66d9ef">new</span> Text(contact.fullName[<span style="color:#ae81ff">0</span>])));
    }

    <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">Contact</span> {
      <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> fullName;
      <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> email;

      <span style="color:#66d9ef">const</span> Contact({<span style="color:#66d9ef">this</span>.fullName, <span style="color:#66d9ef">this</span>.email});
    }
</code></pre></div><p>请让我知道这对你有没有用。</p>
<h1 id="带有粘性标题的每个部分都应该是带有-sliverpinnedheader-和-sliverlist-的多条然后将-pushpinnedchildren-设置为-true-应该会提供您正在寻找的粘性标题效果">带有粘性标题的每个部分都应该是带有 SliverPinnedHeader 和 SliverList 的多条。然后将 pushPinnedChildren 设置为 true 应该会提供您正在寻找的粘性标题效果。</h1>
<h1 id="flutter---如何将gridview放在column小部件中的card小部件附近">flutter - 如何将Gridview放在Column小部件中的Card小部件附近</h1>
<p>正在尝试为我的应用创建用户界面。我需要这样设计:
<a href="https://i.stack.imgur.com/zoN7s.jpg">
        <a data-fancybox="gallery" href="https://i.stack.imgur.com/zoN7s.jpg">
            <img class="mx-auto" alt="enter image description here" src="https://i.stack.imgur.com/zoN7s.jpg" />
        </a>
    </a>
但是我最近的用户界面如下所示:
<a href="https://i.stack.imgur.com/FcKLg.jpg">
        <a data-fancybox="gallery" href="https://i.stack.imgur.com/FcKLg.jpg">
            <img class="mx-auto" alt="enter image description here" src="https://i.stack.imgur.com/FcKLg.jpg" />
        </a>
    </a>
在第二个屏幕截图中，我向下滚动是因为我的gridview小部件(具有4个卡式小部件)没有更接近其他小部件。其他小部件是:标题栏小部件，具有图形和子图小部件的卡片小部件。我将标题栏和图形卡小部件放在堆栈中以在上方显示它们。我将这两个组合的小部件与gridview小部件一起放在一列中。我用SingleChildScrollView小部件包装此列小部件，因为我希望页面可滚动。 <strong>因此，我的问题是:如何像第一个图像那样将gridview小部件放置得更靠近卡片小部件？</strong>
这是我用于此UI的代码:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter_circular_chart/flutter_circular_chart.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:intl/intl.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;baskana_rapor_icon_icons.dart&#39;</span>;

<span style="color:#75715e">// ignore: must_be_immutable
</span><span style="color:#75715e"></span><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MainPage</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  List<span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span> widgets <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> List();
  List<span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span> dataList <span style="color:#f92672">=</span> _loadData();
  <span style="color:#66d9ef">int</span> _totalCount;
  Widget s1, s2, total;
  <span style="color:#66d9ef">final</span> formatter <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> NumberFormat(<span style="color:#e6db74">&#34;#,##&#34;</span>);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    widgets.add(_buildBody(context));

    <span style="color:#66d9ef">return</span> Scaffold(body: _buildBody(context));
  }

  Widget _buildBody(BuildContext context) {
    <span style="color:#66d9ef">return</span> LayoutBuilder(
      builder: (BuildContext context, BoxConstraints viewportConstraints) {
        <span style="color:#66d9ef">return</span> SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            <span style="color:#75715e">//mainAxisAlignment: MainAxisAlignment.spaceBetween,
</span><span style="color:#75715e"></span>            children: [
              Stack(
                children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                  Container(
                    height: MediaQuery.of(context).size.height,
                    width: MediaQuery.of(context).size.width,
                  ),
                  _buildTitleBar(context),
                  Positioned(bottom: <span style="color:#ae81ff">65</span>, left: <span style="color:#ae81ff">35</span>, child: _buildCard(context)),
                ],
              ),
              _buildGridButtons(context),
            ],
          ),
        );
      },
    );
  }

  Widget _buildGridButtons(BuildContext context) {
    <span style="color:#66d9ef">int</span> itemWidth <span style="color:#f92672">=</span> <span style="color:#ae81ff">80</span>;
    <span style="color:#66d9ef">int</span> itemHeight <span style="color:#f92672">=</span> <span style="color:#ae81ff">40</span>;
    <span style="color:#66d9ef">return</span> SafeArea(
      child: Column(
        children: [
          GridView.count(
            crossAxisCount: <span style="color:#ae81ff">2</span>,
            childAspectRatio: (itemWidth <span style="color:#f92672">/</span> itemHeight),
            shrinkWrap: <span style="color:#66d9ef">true</span>,
            primary: <span style="color:#66d9ef">true</span>,
            children: [
              GestureDetector(
                onTap: () {
                  Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/MahalleRapor&#39;</span>);
                },
                child: Card(
                  color: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(<span style="color:#ae81ff">25</span>),
                    ),
                  ),
                  child: Stack(
                    alignment: Alignment.center,
                    children: [
                      Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        mainAxisAlignment: MainAxisAlignment.spaceAround,
                        children: [
                          Icon(
                            BaskanaRaporIcon.mahalle_raporu,
                            color: Colors.redAccent,
                            size: <span style="color:#ae81ff">30</span>,
                          ),
                          Text(
                            <span style="color:#e6db74">&#39;Mahalle Raporu&#39;</span>,
                            style: TextStyle(
                              color: Colors.black87,
                              fontSize: <span style="color:#ae81ff">20</span>,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          SizedBox(
                            height: <span style="color:#ae81ff">5</span>,
                          )
                        ],
                      ),
                      Positioned(
                        bottom: <span style="color:#ae81ff">0</span>,
                        right: <span style="color:#ae81ff">1</span>,
                        left: <span style="color:#ae81ff">1</span>,
                        child: Divider(
                          color: Colors.redAccent,
                          endIndent: <span style="color:#ae81ff">45</span>,
                          indent: <span style="color:#ae81ff">50</span>,
                          thickness: <span style="color:#ae81ff">3</span>,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              GestureDetector(
                onTap: () {
                  Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/BirimRapor&#39;</span>);
                },
                child: Card(
                  color: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(<span style="color:#ae81ff">25</span>),
                    ),
                  ),
                  child: Stack(
                    alignment: Alignment.center,
                    children: [
                      Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        mainAxisAlignment: MainAxisAlignment.spaceAround,
                        children: [
                          Icon(
                            BaskanaRaporIcon.birim_raporu,
                            color: Colors.green[<span style="color:#ae81ff">300</span>],
                            size: <span style="color:#ae81ff">30</span>,
                          ),
                          Text(
                            <span style="color:#e6db74">&#39;Birim Raporu&#39;</span>,
                            style: TextStyle(
                              color: Colors.black87,
                              fontSize: <span style="color:#ae81ff">20</span>,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          SizedBox(
                            height: <span style="color:#ae81ff">5</span>,
                          )
                        ],
                      ),
                      Positioned(
                        bottom: <span style="color:#ae81ff">0</span>,
                        right: <span style="color:#ae81ff">1</span>,
                        left: <span style="color:#ae81ff">1</span>,
                        child: Divider(
                          color: Colors.green[<span style="color:#ae81ff">300</span>],
                          endIndent: <span style="color:#ae81ff">45</span>,
                          indent: <span style="color:#ae81ff">50</span>,
                          thickness: <span style="color:#ae81ff">3</span>,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              GestureDetector(
                onTap: () {
                  Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/GelirGider&#39;</span>);
                },
                child: Card(
                  color: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(<span style="color:#ae81ff">25</span>),
                    ),
                  ),
                  child: Stack(
                    alignment: Alignment.center,
                    children: [
                      Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        mainAxisAlignment: MainAxisAlignment.spaceAround,
                        children: [
                          Icon(
                            BaskanaRaporIcon.gelir_gider,
                            color: Colors.yellow[<span style="color:#ae81ff">700</span>],
                            size: <span style="color:#ae81ff">30</span>,
                          ),
                          Text(
                            <span style="color:#e6db74">&#39;Gelir / Gider&#39;</span>,
                            style: TextStyle(
                              color: Colors.black87,
                              fontSize: <span style="color:#ae81ff">20</span>,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          SizedBox(
                            height: <span style="color:#ae81ff">5</span>,
                          )
                        ],
                      ),
                      Positioned(
                        bottom: <span style="color:#ae81ff">0</span>,
                        right: <span style="color:#ae81ff">1</span>,
                        left: <span style="color:#ae81ff">1</span>,
                        child: Divider(
                          color: Colors.yellow[<span style="color:#ae81ff">700</span>],
                          endIndent: <span style="color:#ae81ff">45</span>,
                          indent: <span style="color:#ae81ff">50</span>,
                          thickness: <span style="color:#ae81ff">3</span>,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              GestureDetector(
                onTap: () {
                  Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/BaskanaMesaj&#39;</span>);
                },
                child: Card(
                  color: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(<span style="color:#ae81ff">25</span>),
                    ),
                  ),
                  child: Stack(
                    alignment: Alignment.center,
                    children: [
                      Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        mainAxisAlignment: MainAxisAlignment.spaceAround,
                        children: [
                          Icon(
                            BaskanaRaporIcon.baskana_msg,
                            color: Colors.blueAccent,
                            size: <span style="color:#ae81ff">30</span>,
                          ),
                          Text(
                            <span style="color:#e6db74">&#39;Başkana Mesaj&#39;</span>,
                            style: TextStyle(
                              color: Colors.black87,
                              fontSize: <span style="color:#ae81ff">20</span>,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          SizedBox(
                            height: <span style="color:#ae81ff">5</span>,
                          )
                        ],
                      ),
                      Positioned(
                        bottom: <span style="color:#ae81ff">0</span>,
                        right: <span style="color:#ae81ff">1</span>,
                        left: <span style="color:#ae81ff">1</span>,
                        child: Divider(
                          color: Colors.blueAccent,
                          endIndent: <span style="color:#ae81ff">45</span>,
                          indent: <span style="color:#ae81ff">50</span>,
                          thickness: <span style="color:#ae81ff">3</span>,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          )
        ],
      ),
    );
  }

  <span style="color:#75715e">// ignore: todo
</span><span style="color:#75715e"></span>  <span style="color:#75715e">//TODO: Better implementation of UI
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">double</span> buttonHeight <span style="color:#f92672">=</span> <span style="color:#ae81ff">50</span>;

  Widget _buildCard(BuildContext context) {
    <span style="color:#66d9ef">return</span> Center(
      child: Container(
        height: <span style="color:#ae81ff">500</span> <span style="color:#f92672">+</span> buttonHeight,
        child: Stack(
          alignment: Alignment.center,
          overflow: Overflow.visible,
          children: [
            Card(
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(<span style="color:#ae81ff">15</span>),
                side: BorderSide(color: Colors.blueGrey, width: <span style="color:#ae81ff">0.5</span>),
              ),
              child: Container(
                height: MediaQuery.of(context).size.height <span style="color:#f92672">*</span> .<span style="color:#ae81ff">65</span>,
                width: MediaQuery.of(context).size.width <span style="color:#f92672">*</span> .<span style="color:#ae81ff">80</span>,
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  mainAxisSize: MainAxisSize.max,
                  children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                    Padding(
                      padding: <span style="color:#66d9ef">const</span> EdgeInsets.all(<span style="color:#ae81ff">8.0</span>),
                      child: Text(
                        <span style="color:#e6db74">&#34;Genel Durum&#34;</span>,
                        style: TextStyle(
                          fontSize: <span style="color:#ae81ff">20</span>,
                          color: Colors.black,
                          letterSpacing: <span style="color:#ae81ff">0.3</span>,
                        ),
                      ),
                    ),
                    Divider(
                      color: Colors.grey,
                      thickness: <span style="color:#ae81ff">0.3</span>,
                      endIndent: <span style="color:#ae81ff">10</span>,
                      indent: <span style="color:#ae81ff">10</span>,
                    ),
                    _buildChart(dataList),
                    SizedBox(
                      height: <span style="color:#ae81ff">20</span>,
                    ),
                    _buildSubGraph(),
                    SizedBox(
                      height: <span style="color:#ae81ff">40</span>,
                    ),
                  ],
                ),
              ),
            ),
            Positioned(
              <span style="color:#75715e">//top: -buttonHeight /2,
</span><span style="color:#75715e"></span>              bottom: <span style="color:#ae81ff">27</span>,
              child: _buildDetailsButton(context),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildDetailsButton(BuildContext context) {
    <span style="color:#66d9ef">return</span> ButtonTheme(
      height: <span style="color:#ae81ff">50</span>,
      minWidth: <span style="color:#ae81ff">100</span>,
      child: RaisedButton(
        onPressed: () {
          Navigator.pushNamed(context, <span style="color:#e6db74">&#39;/DetailPage&#39;</span>);
        },
        color: Colors.white,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(<span style="color:#ae81ff">30</span>),
        ),
        child: Text(<span style="color:#e6db74">&#34;Detayları Gör&#34;</span>),
      ),
    );
  }

  Row _buildSubGraph() {
    <span style="color:#66d9ef">String</span> s1 <span style="color:#f92672">=</span> formatter.format((dataList[<span style="color:#ae81ff">1</span>].value <span style="color:#f92672">/</span> _totalCount) <span style="color:#f92672">*</span> <span style="color:#ae81ff">100</span>);
    <span style="color:#66d9ef">String</span> s0 <span style="color:#f92672">=</span> formatter.format((dataList[<span style="color:#ae81ff">0</span>].value <span style="color:#f92672">/</span> _totalCount) <span style="color:#f92672">*</span> <span style="color:#ae81ff">100</span>);

    <span style="color:#66d9ef">return</span> Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: [
        Column(
          <span style="color:#75715e">//İşlemde
</span><span style="color:#75715e"></span>          children: [
            Text(
              dataList[<span style="color:#ae81ff">1</span>].rankKey,
              style: TextStyle(
                fontSize: <span style="color:#ae81ff">18</span>,
                color: Colors.black87,
              ),
            ),
            Container(
              decoration: BoxDecoration(
                color: dataList[<span style="color:#ae81ff">1</span>].color,
                borderRadius: BorderRadius.only(
                  topRight: Radius.circular(<span style="color:#ae81ff">5</span>),
                  bottomRight: Radius.circular(<span style="color:#ae81ff">5</span>),
                  bottomLeft: Radius.circular(<span style="color:#ae81ff">5</span>),
                ),
              ),
              height: <span style="color:#ae81ff">50</span>,
              width: <span style="color:#ae81ff">150</span>,
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  Text(
                    <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">${</span>dataList[<span style="color:#ae81ff">1</span>].value.toInt()<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>,
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: <span style="color:#ae81ff">20</span>,
                    ),
                  ),
                  SizedBox(
                    width: <span style="color:#ae81ff">50</span>,
                  ),
                  Flexible(
                    child: Text(
                      <span style="color:#e6db74">&#39;%&#39;</span> <span style="color:#f92672">+</span> s1,
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: <span style="color:#ae81ff">16</span>,
                        fontWeight: FontWeight.w300,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
        Column(
          <span style="color:#75715e">//Sonuçlanan
</span><span style="color:#75715e"></span>          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            Text(
              dataList[<span style="color:#ae81ff">0</span>].rankKey,
              style: TextStyle(
                fontSize: <span style="color:#ae81ff">18</span>,
                color: Colors.black87,
              ),
            ),
            Container(
              height: <span style="color:#ae81ff">50</span>,
              width: <span style="color:#ae81ff">150</span>,
              decoration: BoxDecoration(
                color: dataList[<span style="color:#ae81ff">0</span>].color,
                borderRadius: BorderRadius.only(
                  topRight: Radius.circular(<span style="color:#ae81ff">5</span>),
                  bottomRight: Radius.circular(<span style="color:#ae81ff">5</span>),
                  bottomLeft: Radius.circular(<span style="color:#ae81ff">5</span>),
                ),
              ),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  Text(
                    <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">${</span>dataList[<span style="color:#ae81ff">0</span>].value.toInt()<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>,
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: <span style="color:#ae81ff">20</span>,
                    ),
                  ),
                  SizedBox(
                    width: <span style="color:#ae81ff">50</span>,
                  ),
                  Flexible(
                    child: Text(
                      <span style="color:#e6db74">&#39;%&#39;</span> <span style="color:#f92672">+</span> s0,
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: <span style="color:#ae81ff">16</span>,
                        fontWeight: FontWeight.w300,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        )
      ],
    );
  }

  <span style="color:#75715e">//Map&lt;String, double&gt; dataMap, List&lt;Color&gt; colorList,BuildContext context
</span><span style="color:#75715e"></span>  Widget _buildChart(List<span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span> dataList) {
    _totalCount <span style="color:#f92672">=</span> _findTotalCount(dataList);
    s1 <span style="color:#f92672">=</span> _createText(<span style="color:#e6db74">&#34;TOPLAMDA&#34;</span>, <span style="color:#ae81ff">20</span>, Colors.grey[<span style="color:#ae81ff">600</span>], <span style="color:#66d9ef">false</span>);
    s1 <span style="color:#f92672">=</span> _createText(<span style="color:#e6db74">&#34;TALEP&#34;</span>, <span style="color:#ae81ff">20</span>, Colors.grey[<span style="color:#ae81ff">600</span>], <span style="color:#66d9ef">false</span>);
    total <span style="color:#f92672">=</span> _createText(<span style="color:#e6db74">&#39;</span><span style="color:#e6db74">$</span>_totalCount<span style="color:#e6db74">&#39;</span>, <span style="color:#ae81ff">24</span>, Colors.black87, <span style="color:#66d9ef">true</span>);
    <span style="color:#66d9ef">return</span> Container(
      child: AnimatedCircularChart(
        size: Size(<span style="color:#ae81ff">500</span>, <span style="color:#ae81ff">250</span>),
        initialChartData: <span style="color:#f92672">&lt;</span>CircularStackEntry<span style="color:#f92672">&gt;</span>[
          CircularStackEntry(
            <span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span>[
              dataList[<span style="color:#ae81ff">0</span>],
              dataList[<span style="color:#ae81ff">1</span>],
            ],
          ),
        ],
        chartType: CircularChartType.Radial,
        startAngle: <span style="color:#f92672">-</span><span style="color:#ae81ff">90</span>,
        holeRadius: <span style="color:#ae81ff">25</span>,
        holeLabel:
            <span style="color:#e6db74">&#34;TOPLAMDA </span><span style="color:#ae81ff">\n\t\t\t\t\t\t\t</span><span style="color:#e6db74"> </span><span style="color:#e6db74">$</span>_totalCount<span style="color:#e6db74"> </span><span style="color:#ae81ff">\n\t\t\t</span><span style="color:#e6db74"> TALEP&#34;</span>, <span style="color:#75715e">// $s1 \n\t\t\t\t\t\t\t $total \n\t\t\t $s2
</span><span style="color:#75715e"></span>      ),
    );
  }

  Widget _buildTitleBar(BuildContext context) {
    <span style="color:#66d9ef">return</span> Align(
      alignment: Alignment.topCenter,
      child: Column(
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          Container(
            height: MediaQuery.of(context).size.height <span style="color:#f92672">*</span> .<span style="color:#ae81ff">247</span>,
            decoration: BoxDecoration(
              color: Colors.blue,
              shape: BoxShape.rectangle,
              borderRadius: BorderRadius.vertical(
                bottom: Radius.circular(<span style="color:#ae81ff">25</span>),
              ),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                Icon(
                  Icons.assessment,
                  color: Colors.white,
                ),
                Text(
                  <span style="color:#e6db74">&#34;Genel Durum&#34;</span>,
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: <span style="color:#ae81ff">28</span>,
                    fontWeight: FontWeight.bold,
                    letterSpacing: <span style="color:#ae81ff">0.5</span>,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

Widget _createText(<span style="color:#66d9ef">String</span> msg, <span style="color:#66d9ef">double</span> size, Color color, <span style="color:#66d9ef">bool</span> isBold) {
  <span style="color:#66d9ef">return</span> Text(
    msg,
    style: TextStyle(
      color: color,
      fontSize: size,
      fontWeight: isBold <span style="color:#f92672">?</span> FontWeight.bold <span style="color:#f92672">:</span> FontWeight.normal,
    ),
  );
}

<span style="color:#66d9ef">int</span> _findTotalCount(List<span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span> dataList) {
  <span style="color:#66d9ef">int</span> result <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>;
  <span style="color:#66d9ef">for</span> (<span style="color:#66d9ef">int</span> i <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>; i <span style="color:#f92672">&lt;</span> dataList.length; i<span style="color:#f92672">++</span>) {
    result <span style="color:#f92672">+=</span> (dataList[i].value).toInt();
  }
  <span style="color:#66d9ef">return</span> result;
}

List<span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span> _loadData() {
  List<span style="color:#f92672">&lt;</span>CircularSegmentEntry<span style="color:#f92672">&gt;</span> dataList <span style="color:#f92672">=</span> [];
  CircularSegmentEntry chartData1 <span style="color:#f92672">=</span>
      <span style="color:#66d9ef">new</span> CircularSegmentEntry(<span style="color:#ae81ff">150</span>, Colors.greenAccent, rankKey: <span style="color:#e6db74">&#39;Sonuçlanan&#39;</span>);
  CircularSegmentEntry chartData2 <span style="color:#f92672">=</span>
      <span style="color:#66d9ef">new</span> CircularSegmentEntry(<span style="color:#ae81ff">150</span>, Colors.blue, rankKey: <span style="color:#e6db74">&#39;İşlemde&#39;</span>);
  dataList.add(chartData1);
  dataList.add(chartData2);
  <span style="color:#66d9ef">return</span> dataList;
}
</code></pre></div><p><strong>额外的问题:如果我可以做些更有效的设计，您能告诉我吗？谢谢!</strong></p>
<p><strong>最佳答案</strong></p>
<p>也许是由于堆栈中的这段代码而发生的。此容器占用您的全屏尺寸。这就是为什么您的GridView项目会在屏幕大小之后立即生成。尝试删除此容器或减小其高度。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Container(
     height: MediaQuery.of(context).size.height,
     width: MediaQuery.of(context).size.width,
   ),
</code></pre></div><p><strong>更新:</strong>
你可以试试看我没有尝试过，但这也许会有所帮助</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Stack(
    children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
      Align(
        alignment: Alignment.topCenter,
        child: _buildTitleBar(context),
      ),
      Align(
        alignment: Alignment.topCenter,
        child: Container(
          margin: EdgeInsets.only(top: <span style="color:#ae81ff">100</span>),
          child: _buildCard(context),
        ),
      )
    ],
  )
</code></pre></div>
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